Follow https://support.microsoft.com/en-us/word/define-new-bullets-numbers-and-multilevel-lists
Define a new multilevel list
Select the text or numbered list you want to change.
On the Home tab, in the Paragraph group, click the arrow next to Multilevel List
, and then click Define New Multilevel List.
Expand the Multilevel list dialog box by clicking More in the lower left corner.
Choose the list level to modify by selecting it in the list. 1 is selected by default.
Choose where you would like to apply your changes by clicking Whole list, This point forward, or Current paragraph.
To use an existing style in Word for each level in the list, choose a style under Link level to style.
Choose the number to show in the gallery. Level 1 is shown by default.
Give the multilevel list a name in the ListNum field list name. This name will appear wherever you see the Listnum field.
To append the numbered list with a dash, parentheses, or another value, enter it in the Number format field.
To change the font size, style, and color, click Font and choose a setting on the Font tab or Advanced tab:.
| Tab |
Description |
| Font tab |
Change the bullet font, style, size, color, underline style, underline color, and effects. |
|
|
| Font tab |
Change the bullet font, style, size, color, underline style, underline color, and effects. |
| Advanced tab |
Change the bullet font character spacing and OpenType features. |
To change the style, click the down arrow next to Number style and choose numbers, letters, or another chronological format. Specify a level number to include this from.
Choose the number to start the list at. The default value is 1. To restart numbering after a specific level, select the Restart List After check box and choose a level in the list.
Select Legal Style Numbering to enforce a legal style on the multilevel list.
To change the number alignment, choose Left, Centered, or Right under Alignment.
Specify a value for where to start the alignment and a value for the text indent.
To apply these values to the entire list, choose Set for All Levels.
Enter a value for what should follow each number, Tab character, Space, or Nothing. Check Add tab stop at and enter a value.
Click OK.
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hth
Marcin